WO2021065791A1 - Noyau d'inducteur, stylo électronique et dispositif d'entrée - Google Patents

Noyau d'inducteur, stylo électronique et dispositif d'entrée Download PDF

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Publication number
WO2021065791A1
WO2021065791A1 PCT/JP2020/036605 JP2020036605W WO2021065791A1 WO 2021065791 A1 WO2021065791 A1 WO 2021065791A1 JP 2020036605 W JP2020036605 W JP 2020036605W WO 2021065791 A1 WO2021065791 A1 WO 2021065791A1
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Prior art keywords
less
pores
mass
inductor core
oxide
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PCT/JP2020/036605
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English (en)
Japanese (ja)
Inventor
ひとみ 落合
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京セラ株式会社
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Priority to JP2021551245A priority Critical patent/JP7198370B2/ja
Priority to US17/764,907 priority patent/US11955266B2/en
Publication of WO2021065791A1 publication Critical patent/WO2021065791A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/045—Fixed inductances of the signal type  with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03545—Pens or stylus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
    • H01F1/342—Oxides
    • H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/255—Magnetic cores made from particles

Definitions

  • the present invention relates to an inductor core, an electronic pen, and an input device.
  • an electronic pen In an input device that detects a position on a tablet or display on which a position detection sensor is arranged and inputs position information to a PC (Personal Computer) or a smartphone, an electronic pen is used to indicate the position on the position detection sensor. It is used.
  • Patent Document 1 As such an electronic pen, in Patent Document 1, in Patent Document 1, a writing unit capable of writing lines on a paper surface, a ferrite core in which an electromagnetic induction coil is arranged on the outer periphery, and a pressure applied to the writing unit are detected.
  • a digitizer writing instrument containing a pressure-sensitive sensor has been proposed.
  • the tip portion of the barrel is formed in a tapered shape whose outer diameter gradually decreases, and an opening in which the writing unit protrudes is formed at the tip.
  • the ferrite core is formed separately from the writing unit and is located in parallel with the writing unit in the barrel.
  • the inductor core of the present disclosure includes a columnar magnetic body made of a magnetic material having pores.
  • the magnetic body is an inclined portion having an inclined surface forming a peripheral surface of a truncated cone whose outer diameter increases from one end to the other end of the magnetic body; It has an outer peripheral surface extending toward and forming a peripheral surface of a columnar body, and has a straight body portion connected to an inclined portion.
  • the difference between the average value of the distance between the centers of gravity of the pores in the straight body and the average diameter of the pores in the straight body is larger than the difference between the average value of the distance between the centers of gravity of the pores in the inclined portion and the average diameter of the pores in the inclined portion. large.
  • the electronic pen of the present disclosure includes a housing having an opening, a writing unit capable of writing on the surface to be written, and the above-mentioned inductor core.
  • the writing unit is located along the central axis of the housing, and the inductor core is located inside the housing alongside the writing unit.
  • the input device of the present disclosure includes the above-mentioned electronic pen and a position detecting device including a sensor for detecting a position where the electronic pen is close to the electronic pen.
  • the inductor core of the present disclosure even if the straight body portion becomes thin, the pores that reduce the mechanical strength and rigidity are sparsely scattered. As a result, the straight body portion is less likely to be damaged, and a highly reliable inductor core can be realized.
  • the electronic pen of the present disclosure has a highly reliable inductor core. As a result, a highly reliable electronic pen can be provided.
  • the input device of the present disclosure has a highly reliable electronic pen. As a result, a highly reliable input device can be provided.
  • a first embodiment of the inductor core according to the present disclosure is shown, (A) is a plan view, and (B) is an enlarged cross-sectional view of part A of (A).
  • a second embodiment of the inductor core according to the present disclosure is shown, (A) is a plan view, and (B) is an enlarged cross-sectional view of a portion B of (A).
  • FIG. 1 An embodiment of the electronic pen according to the present disclosure is shown, (A) is a cross-sectional view cut along the central axis direction, (B) is a cross-sectional view taken along the CC'line of (A), and (C). Is a part of an enlarged view of the inductor core shown in (A). It is a perspective view which shows one Embodiment of the input device which concerns on this disclosure.
  • FIG. 1 shows a first embodiment of the inductor core according to the present disclosure.
  • FIG. 1A is a plan view.
  • FIG. 1B is an enlarged cross-sectional view of part A of FIG. 1A.
  • the inductor core 1 is composed of a magnetic body 10 made of a magnetic material such as a ferrite sintered body.
  • the magnetic body body 10 has an inclined portion 11 having an inclined surface 11a forming a peripheral surface of a truncated cone whose outer diameter increases from one end 10a to the other end 10b and coaxially with the inclined portion 11, and the other end 10b to one end 10a. It has an outer peripheral surface 12a of a cylindrical body extending toward, and has a straight body portion 12 connected to an inclined portion 11.
  • the length from one end 10a to the other end 10b of the magnetic body 10 is about 5 mm to 50 mm.
  • the length of the straight body portion 12 is about 3 mm to 12 mm.
  • the outer diameter of the straight body portion 12 is about 2.0 mm to 3.0 mm.
  • the length of the inclined portion 11 is about 0.5 mm to 2.0 mm.
  • the outer diameter of the inclined portion 11 on the one end 10a side is about 1 mm to 2 mm.
  • the outer diameter of the inclined portion 11 opposite to one end 10a is substantially the same as the outer diameter of the straight body portion 12. In this way, the inclined portion 11 has a shape that tapers toward one end 10a.
  • the outer diameter of the inclined portion 11 increases from one end 10a to the other end 10b. That is, the inclined portion 11 has a shape that tapers toward one end 10a.
  • the inclined surface 11a may include an inclined surface 11a1 which is a linear portion and a rounded inclined surface 11a2.
  • the inclined surface 11a1 may form a peripheral surface of the truncated cone.
  • the inclined surface 11a near one end 10a may be a convex curved surface. That is, the inclined surface 11a1 of the inclined portion 11 and the end surface 11b of the inclined portion 11 may be a part of the inclined surface 11a and may be connected by the inclined surface 11a2 which is a convex curved surface.
  • the inclined surface 11a1 and the end surface 11b are connected by an inclined surface 11a2 which is a convex curved surface. Therefore, for example, when the end surface 11b of the inclined portion 11 comes into contact with the housing of the electronic pen, the possibility of damage can be reduced.
  • the radius of curvature of the inclined surface 11a2 connecting the inclined surface 11a1 of the inclined portion 11 and the end surface 11b of the inclined portion 11 is defined as R1.
  • the radius of curvature R1 is about 0.1 mm to 0.2 mm.
  • FIG. 2 shows a second embodiment of the inductor core according to the present disclosure.
  • FIG. 2A is a plan view.
  • FIG. 2B is an enlarged cross-sectional view of portion B of FIG. 2A.
  • the magnetic body body 10 has an inclined portion 11a having an inclined surface 11a forming a peripheral surface of a truncated cone whose outer diameter increases from one end 10a to the other end 10b; coaxially with the inclined portion 11, one end from the other end 10b.
  • a straight body portion 12 forming an outer peripheral surface 12a of a cylindrical body extending toward 10a; and a flange portion 13 located between the inclined portion 11 and the straight body portion 12 and connecting the inclined portion 11 and the straight body portion 12. It is composed of.
  • the inclined portion 11, the flange portion 13, and the straight body portion 12 are arranged in this order from one end 10a toward the other end 10b.
  • the outer peripheral surface 13a of the flange portion 13 has an outer diameter larger than the outer diameters of the inclined surface 11a of the inclined portion 11 and the outer peripheral surface 12a of the straight body portion 12.
  • the maximum value of the outer diameter of the outer peripheral surface 13a of the collar portion 13 is 2.12 mm to 2.72 mm.
  • the flange portion 13 projects from the outer peripheral surface 12a of the straight body portion 12 by a maximum of 0.02 mm to 0.22 mm.
  • the flange portion 13 makes it difficult for the straight body portion 12 to be deformed. Therefore, even if a force is applied to the inclined portion 11 and the inclined portion 11 is deformed, the deformation of the straight body portion 12 can be reduced.
  • the radius of curvature R1 of the inclined surface 11a2 is, for example, 0.1 mm to 0.2 mm in the cross section along the central axis of the magnetic body body 10.
  • the magnetic body 10 forming the inductor core 1 of the first embodiment and the second embodiment described above is a sintered body, a large number of pores are included inside.
  • the difference between the average value of the distance between the centers of gravity of the pores in the straight body portion 12 and the mean diameter of the pores in the straight body portion 12 is the distance between the centers of gravity of the pores in the inclined portion 11.
  • the configuration is larger than the difference between the average value of the distance and the average diameter of the pores at the inclined portion 11.
  • the rigidity of the inclined portion 11 can be lowered and the inclination portion 11 can be easily bent. Therefore, even if the external pressure generated by the grip of the electronic pen is applied to the inclined portion 11 through the housing of the electronic pen, the inclined portion 11 also follows according to the deformation of the housing of the electronic pen. As a result, it is possible to reduce damage starting from the connecting portion between the inclined portion 11 and the straight body portion 12.
  • the difference between the average value of the distance between the centers of gravity of the pores in the vicinity 12c of the other end 10b of the straight body portion 12 and the average diameter of the pores in the vicinity 12c of the other end 10b of the straight body portion 12 is the center of the straight body portion 12.
  • the configuration may be larger than the difference between the average value of the distance between the centers of gravity of the pores in the portion 12b and the average diameter of the pores in the central portion 12b of the straight body portion 12.
  • the tension of the coil tends to be higher in the vicinity 12c at the other end than in the central portion 12b.
  • the number of pores per unit area is smaller in the vicinity 12c of the other end 10b than in the central portion 12b. Therefore, it is possible to reduce the shedding that tends to occur from the vicinity 12c of the other end.
  • FIG. 3 is an example of a micrograph of a mirror surface obtained by polishing an inclined portion.
  • FIG. 4 is an example of a micrograph of a mirror surface obtained by polishing the vicinity of the central portion of the straight body portion.
  • FIG. 5 is an example of a micrograph of a mirror surface obtained by polishing the vicinity of the other end of the straight body portion.
  • the region surrounded by the curve and the point-shaped portion are pores. In this way, the proportion of pores decreases from the inclined portion 11 toward the other end 10b of the straight body portion 12.
  • the portion where the size and distribution of the pores are observed on average from these mirror surfaces is selected from the inclined portion 11, the central portion 12b of the straight body portion 12, and the vicinity 12c of the other end of the straight body portion 12, respectively.
  • area of 3.4 ⁇ 10 5 ⁇ m 2 e.g., horizontal length is 680 micrometer, length in the vertical direction is 500 [mu] m
  • image analysis software measures the distance between the centers of gravity.
  • the measurement of the equivalent circle diameter of the pores is performed by particle analysis of image analysis software with the above image as an observation target.
  • the distance between the centers of gravity of the pores and the equivalent diameter of the circle can be measured by regarding the pore portion of the image as a particle.
  • the brightness of the setting conditions of the image analysis software is darkened, the binarization method is manual, the threshold value is 60 to 80, the small figure removal area is 0.1 ⁇ m 2, and the noise removal filter is provided.
  • the average value is calculated for each, and the average value of the distance between the centers of gravity and the average diameter of the equivalent circle diameter are obtained.
  • the threshold value is set to 60 to 80.
  • the threshold value may be adjusted according to the brightness of the image, which is the observation range.
  • the brightness of the particles is darkened, the binarization method is manual, the small figure removal area is 0.1 ⁇ m 2, and the noise removal filter is provided, so that the markers appearing in the image match the shape of the pores. You can adjust the threshold value.
  • FIG. 6 is an example of a photograph obtained by analyzing the distance between the centers of gravity of the pores on the mirror surface obtained by polishing the inclined portion of the inductor core.
  • FIG. 7 is an example of a photograph obtained by analyzing the distance between the centers of gravity of the pores on the mirror surface obtained by polishing the vicinity of the central portion of the straight body portion of the inductor core.
  • FIG. 8 is an example of a photograph obtained by analyzing the distance between the centers of gravity of the mirror-surfaced pores obtained by polishing the vicinity of the other end of the straight body portion of the inductor core.
  • FIGS. 6 to 8 the pores are shown in the black region in the figure.
  • the straight line shown in these photographs is a straight line connecting the center of gravity points of adjacent pores.
  • the center of gravity point of a pore is the position of the center of gravity of each pore region in the cross section to be analyzed.
  • the straight body portion 12 (FIGS. 7 and 8) has a longer straight line connecting the pores than the inclined portion 11 (FIG. 6).
  • the straight line connecting the pores is longer in the vicinity 12c at the other end than in the central portion 12b.
  • the distance between the centers of gravity is longer on the other end 10b side of the magnetic body 10 than on the one end 10a side of the magnetic body 10.
  • the difference between the average value of the distance between the centers of gravity of the pores in the inclined portion 11 and the average diameter of the pores in the inclined portion 11 is 36.94 ⁇ m.
  • the difference between the average value of the distance between the centers of gravity of the pores in the central portion 12b of the straight body portion 12 and the average diameter of the pores in the central portion of the straight body portion 12 is 48.31 ⁇ m.
  • the difference between the average value of the distance between the centers of gravity of the pores in the vicinity of the other end of the straight body portion 12 and the average diameter of the pores in the vicinity of the other end of the straight body portion 12 is 71.5 ⁇ m.
  • the difference between the average value of the distance between the centers of gravity of the pores in the straight body portion 12 and the average diameter of the pores in the straight body portion 12 is the average value of the distance between the centers of gravity of the pores in the inclined portion 11 and the average value of the pores in the inclined portion 11. It can be said that it is larger than the difference from the diameter. As a result, it can be said that the straight body portion 12 has higher mechanical strength and rigidity than the inclined portion 11 and is less likely to be damaged.
  • the average diameter of the pores of the magnetic body 10 may be 5 ⁇ m or less. When the average diameter of the pores is in this range, the pores are small, so that the surrounding area is less likely to be the starting point of destruction. Therefore, it is possible to provide an inductor core 1 having high mechanical strength and fracture toughness.
  • the apparent porosity of the magnetic body 10 was measured by the Archimedes method and found to be 0.25%.
  • the apparent porosity may be 1.5% or less, and by setting the apparent porosity within this range, the magnetic material body 10 becomes more dense. As a result, an inductor core 1 having high mechanical strength and fracture toughness can be obtained.
  • the apparent porosity is a value defined in JIS C 2141: 1992.
  • the magnetic body 10 is made of ceramics mainly composed of ferrite composed of oxides of Fe, Zn, Ni and Cu, and the coefficient of variation CV of the average crystal grain size of the ceramics represented by the following formula (1) is 0. It may be .08 or more and 0.3 or less.
  • CV ⁇ / x ... (1)
  • x is the average value of the average crystal grain size of the ceramics
  • ⁇ is the standard deviation of the average crystal grain size of the ceramics
  • the main component refers to a component that occupies 95% by mass or more of all the components constituting the ceramic, and is particularly preferably 99% by mass or more.
  • the components constituting the ceramics can be identified from the measurement results by an X-ray diffractometer using CuK ⁇ rays, and the content of the metal components of Fe, Ni, Zn and Cu can be determined by, for example, ICP (Inductively Coupled Plasma) emission spectroscopy. It may be obtained by an analyzer or a fluorescent X-ray analyzer and converted into an oxide.
  • ICP Inductively Coupled Plasma
  • the coefficient of variation CV is 0.08 or more, the particle size of the crystal particles varies appropriately, and small crystal particles are arranged between the large crystal particles. As a result, the fracture toughness can be increased.
  • the coefficient of variation CV is 0.3 or less, the proportion of crystal particles having a large particle size increases with respect to the standard deviation, so that the magnetic permeability becomes high.
  • the coefficient of variation CV is 0.08 or more and 0.3 or less, it can have both high fracture toughness and high magnetic permeability.
  • the coefficient of variation CV is preferably 0.1 or more and 0.2 or less.
  • the average crystal grain size can be determined as follows. First, the fracture surface of the inductor core 1 is polished on a copper plate using diamond abrasive grains having an average particle diameter D 50 of 3 ⁇ m. Then, it is polished on a tin plate using diamond abrasive grains having an average particle size D 50 of 0.5 ⁇ m. The polished surface obtained by these polishings is etched at a temperature of 950 ° C. until the crystal grains and the grain boundary layer can be distinguished from each other to obtain an observation surface.
  • FIG. 9 is a photograph showing an example of the observation surface of the inductor core and how to draw a straight line.
  • the average value, standard deviation, and coefficient of variation CV of the average crystal grain size may be calculated for each of the 42 average crystal grain sizes by selecting 7 screens of such observation surfaces.
  • the kurtosis Ku of the average crystal grain size may be 0 or more.
  • the kurtosis Ku of the average crystal grain size is in this range, the variation in the grain size of the crystal particles is suppressed. Therefore, the aggregation of the pores is reduced, and the shedding that occurs from the contour and the inside of the pores can be reduced.
  • the kurtosis Ku of the average crystal grain size is preferably 1 or more.
  • Kurtosis Ku is an index (statistic) that indicates how much the peak and tail of the distribution differ from the normal distribution.
  • the distribution has a sharp peak.
  • the kurtosis Ku 0, the distribution is normal.
  • the kurtosis Ku ⁇ 0 the distribution has a rounded peak.
  • the kurtosis Ku of the average crystal grain size may be obtained by using the function Kurt provided in Excel (registered trademark, Microsoft Corporation).
  • the skewness Sk of the average crystal grain size may be 0 or more.
  • the distribution of the grain size of the crystal particles moves in the direction of the smaller grain size. Therefore, the aggregation of the pores is reduced, and the shedding caused from the contour and the inside of the pores can be further reduced.
  • Skewness Sk is an index (statistic) indicating how much the distribution is distorted from the normal distribution, that is, the left-right symmetry of the distribution.
  • the skewness Sk>0 the tail of the distribution goes to the right.
  • the skewness Sk 0, the distribution is symmetrical.
  • the skewness Sk ⁇ 0 the tail of the distribution goes to the left.
  • the skewness Sk of the average crystal grain size may be obtained by using the function SKEW provided in Excel (registered trademark, Microsoft Corporation).
  • Fe is 49 mol% or more and 50 mol% or less in terms of Fe 2 O 3
  • Zn is 29 mol% or more and 34 mol% or less in terms of Zn O.
  • Ni is preferably 10 mol% or more and 12.5 mol% or less in terms of NiO
  • Cu is preferably 4 mol% or more and 9 mol% or less in terms of CuO.
  • Inductor cores used in electronic pens are required to have high magnetic permeability, specific resistance (electrical resistance), and Curie temperature.
  • Fe is 49 mol% or more in terms of Fe 2 O 3
  • the magnetic permeability is high, and when it is 50 mol% or less, the specific resistance is high.
  • Zn is 29 mol% or more in terms of ZnO
  • the magnetic permeability is high, and when it is 34 mol% or less, the Curie temperature is high.
  • Ni 10 mol% or more in terms of NiO
  • the Curie temperature is high, and when it is 12.5 mol% or less, the magnetic permeability is high.
  • Cu is 4 mol% or more in terms of CuO
  • the magnetic permeability is high, and when it is 9 mol% or less, the Curie temperature is high.
  • Inductor core for use in an electronic pen Fe, Zn, when Ni and Cu is in the above range, the magnetic permeability 2000 or more, the specific resistance 10 9 ⁇ ⁇ m or more, a Curie temperature be 90 ° C. or higher It can be preferably used.
  • the ratio of the molar% value of Ni in NiO conversion to the molar% value of Zn in ZnO conversion is 2. It is preferably 85 to 3.15.
  • Inductor core comprises at least one of oxide and Bi oxide of Mo, 0.2 parts by mass content calculated as MoO 3 0.01 part by mass or more of the oxides of Mo with respect to the main component of 100 parts by weight It is preferable that the oxide content of Bi is 0.01 part by mass or more and 0.2 part by mass or less in terms of Bi 2 O 3. Oxides of Mo and Bi promote grain growth of the main crystal. Furthermore, by setting the oxide contents of Mo and Bi in the above range, the magnetic permeability can be increased with almost no decrease in the Curie temperature.
  • the oxide content of Mo is 0.05 parts by mass or more and 0.1 parts by mass or less in terms of MoO 3
  • the oxide content of Bi is 0.05 parts by mass in terms of Bi 2 O 3. It is preferable that the amount is 0.1 part by mass or more and 0.1 part by mass or less.
  • the core for an inductor contains at least one of Mn oxide and Ti oxide, and the content of Mn oxide with respect to 100 parts by mass of the main component is 0.01 part by mass or more and 0.3 part by mass in terms of MnO 2. It is preferable that the oxide content of Ti is 0.01 part by mass or more and 0.2 part by mass or less in terms of TiO 2. Since Mn and Ti can have a plurality of valences, the oxygen defects of the ferrite crystal, which is the main crystal, can be filled with excess oxygen due to the change in valence during firing. As a result, oxygen defects in the ferrite crystal are reduced and the magnetic permeability can be increased.
  • the inductor core contains Zr oxide, and the content of Zr oxide with respect to 100 parts by mass of the main component is preferably 0.01 part by mass or more and 0.2 part by mass or less in terms of ZrO 2.
  • the Zr oxide content is preferably 0.02 parts by mass or more and 0.11 parts by mass or less in terms of ZrO 2.
  • the inductor core contains an oxide of Cr, and the content of the oxide of Cr with respect to 100 parts by mass of the main component is preferably 0.02 part by mass or more and 0.3 part by mass or less in terms of Cr 2 O 3.
  • the Cr oxide content is preferably 0.02 part by mass or more and 0.3 part by mass or less in terms of Cr 2 O 3.
  • Metal elements other than the principal component may be measured using an ICP (Inductively Coupled Plasma) emission spectroscopic analyzer or a glow discharge mass spectrometer (GDMS), and each may be converted into an oxide.
  • ICP Inductively Coupled Plasma
  • GDMS glow discharge mass spectrometer
  • At least a part of the ferrite crystal has a Fe content in the central portion of the ferrite crystal higher than the Fe content in the outer edge portion of the ferrite crystal.
  • the outer edge is 20% of the major axis from the interface of the ferrite crystal observed on the surface that has been thermally etched (hereinafter, this surface may be referred to as "observation surface") after the inductor core is mirror-polished.
  • the major axis refers to the length of a grain (ferrite crystal) in the longest direction as described in JIS R 1670: 2006.
  • the central portion means a region from the center of the major axis of the ferrite crystal toward the interface to a length of 20% of the major axis.
  • a ferrite crystal having a size in the range of D 40 to D 60 shall be selected.
  • the Fe content in a ferrite crystal is 100% by mass of the content of each spot obtained by applying spots ( ⁇ 1 nm) to the central portion and the outer edge portion using an energy dispersive X-ray spectrometer (EDS). Refers to the content of Fe when
  • the difference between the Fe content in the central portion and the Fe content in the outer edge portion is preferably 1.3% by mass or more and 4.0% by mass or less. With such a configuration, it is possible to have a higher magnetic permeability while maintaining the Curie temperature. It is presumed that the reason for this is that the divalent Fe and the trivalent Fe are present in the optimum ratios in the central portion and the outer edge portion of the ferrite crystal.
  • the X-ray diffraction peak intensity obtained by X-ray diffraction using Cu-K ⁇ rays at a diffraction angle (2 ⁇ ) of 35 ° or more and 36 ° or less is I 1 , and the diffraction angle (2 ⁇ ) is 29.5 ° or more and 30.5.
  • I 2 / I 1 is 0.29 or more and 0.38 or less.
  • the half width of the X-ray diffraction peak intensity I 1 is preferably 0.05 or more and 0.35 or less. With such a configuration, the ferrite crystal can be grown without increasing the number of amorphous grain boundary layers too much, so that the mechanical properties can be improved without lowering the magnetic permeability.
  • the half width is half the width between the diffraction peaks at 1/2 intensity of the maximum value of the X-ray diffraction peak intensity when the diffraction angle (2 ⁇ ) is 35 ° or more and 36 ° or less in the obtained diffraction chart. ..
  • I 3 / I 1 is preferably 0.14 or less.
  • At least the inclined portion 11 contains Mo, and Mo may be contained more in the grain boundary layer sandwiched between adjacent ferrite crystals than in the grains of the ferrite crystal.
  • Mo may be contained more in the grain boundary layer sandwiched between adjacent ferrite crystals than in the grains of the ferrite crystal.
  • the Mo content in the grains of the ferrite crystal and in the grain boundary layer may be elementally analyzed using a transmission electron microscope and an energy dispersive X-ray spectroscope (EDS) attached to the transmission electron microscope.
  • EDS energy dispersive X-ray spectroscope
  • the magnetic body 10 used for the inductor core 1 can be manufactured as follows. First, as a starting material, an oxide of Fe, Zn, Ni and Cu, or a metal salt such as a carbonate or a nitrate that produces an oxide by firing is prepared. At this time, the average particle size is, for example, 0 when Fe is iron oxide (Fe 2 O 3 ), Zn is zinc oxide (ZnO), Ni is nickel oxide (NiO), and Cu is copper oxide (CuO). .5 ⁇ m or more and 5 ⁇ m or less.
  • Fe is 49 mol% or more and 50 mol% or less in terms of Fe 2 O 3
  • Zn is 29 mol% or more and 34 mol% or less in terms of ZnO
  • Ni is 10 mol in terms of NiO.
  • Fe source powder, Zn source powder, Ni source powder and Cu source powder are in the above range. Set to be.
  • the Fe source powder, the Zn source powder, the Ni source powder, and the Cu source powder are all oxide powders.
  • a first raw material composed of a calcined powder composed of Fe 2 O 3- ZnO-NiO and a second raw material composed of a calcined powder composed of Fe 2 O 3-CuO For the first feedstock, iron oxide, zinc oxide and nickel oxide are weighed in the desired amounts. For the second feedstock, iron oxide and copper oxide are weighed to the desired amounts.
  • the amount of iron oxide added in the production of the first raw material and the second raw material is such that the amount of iron oxide added in the production of the second raw material is, for example, equimolar% with copper oxide, and the remaining amount is the second. Used for producing the raw material of 1.
  • the powders weighed for the first raw material and the second raw material are pulverized and mixed by separate ball mills, vibration mills, or the like. Then, for the production of the first raw material, it is calcined at 750 ° C. for 2 hours or more in a reducing atmosphere. Regarding the preparation of the second raw material, each is calcined at 650 ° C. for 2 hours or more in a reducing atmosphere. By such a procedure, each calcined body is obtained.
  • the first raw material and the second raw material which are the first raw material and the second raw material, are placed in different ball mills, vibration mills, or the like and pulverized to form the first raw material and the second raw material, which are the calcined powder.
  • the calcined body as the second raw material is pulverized so that the average particle size D 50 is 0.7 ⁇ m or less.
  • the first raw material and the second raw material are weighed to a desired amount and mixed. By recalcining the mixture in the air under the conditions of 600 ° C. or higher and 700 ° C. or lower and a heating rate of 100 ° C./hour or lower, calcining synthesized into ferrite composed of oxides of Fe, Zn, Ni and Cu. The body is obtained.
  • the calcined body obtained by re-temporary firing is placed in a ball mill or vibration mill and crushed, and a predetermined amount of binder or the like is added to make a slurry.
  • Spherical granules are obtained by spraying and granulating the slurry obtained using a spray dryer.
  • the calcined product obtained by re-temporary firing is pulverized until the average particle size D 50 is 0.7 ⁇ m or less, I 3 / I 1 can be reduced to 0.14 or less. If the average particle size D 50 is to be reduced, the crushing time must be increased. When pulverized for a long time, there is a high possibility that particles desorbed from the balls used for pulverization are mixed in. Therefore, the lower limit of the average particle size D 50 is preferably 0.5 ⁇ m.
  • Powders such as titanium oxide (TiO 2 ), zirconium oxide (ZrO 2 ), and chromium oxide (Cr 2 O 3 ) may be added at the time of pulverization after re-pre-baking.
  • the inductor core 1 is contained in the intergranular layer.
  • Molybdenum oxide (MoO 3 ) powder is added, for example, 0.01 part by mass or more and 0.03 part by mass or less to a slurry obtained by adding 100 parts by mass of the powder obtained by crushing the body. Spherical granules may be obtained by spraying the obtained slurry and granulating it.
  • the pressure is adjusted so that a larger pressure is applied to the straight body portion 12 side than to the inclined portion 11 side. In this way, it is possible to configure the magnetic body body 10 so that the distribution density of pores increases from the other end 10b toward one end 10a.
  • the molded product is subjected to degreasing treatment in a degreasing furnace in the range of 400 to 800 ° C. to obtain a degreased body.
  • a firing furnace at a maximum temperature of 1000 to 1200 ° C. for 2 to 5 hours and firing it, the magnetic body 10 can be formed and the inductor core 1 of the present embodiment can be obtained.
  • the heating rate in firing is 100 ° C. It is preferable that the temperature is at least / hour and at least 300 ° C./hour.
  • the temperature lowering rate from the maximum temperature to 600 ° C. may be in the range of 500 ° C./hour to 1200 ° C./hour.
  • an inductor core in which the Fe content in the central portion of the ferrite crystal is larger than the Fe content in the outer edge portion of the ferrite crystal perform the following. That is, among the starting materials, zinc oxide, nickel oxide, and copper oxide powders are weighed and mixed so as to be within the above ranges, and the mixed powder is divided into two equal parts.
  • the iron oxide powder is added to the above powder divided into two equal parts, for example, 25 mol% and 24.5 mol%, and pulverized and mixed by a ball mill or a vibration mill.
  • the 25 mol% addition side is a third mixed powder
  • the 24.5 mol% addition side is a fourth mixed powder.
  • the third calcined body After that, put the third calcined body together with water in a ball mill or the like to crush and mix.
  • the fourth calcined body is also crushed and mixed by putting it in another ball mill or the like together with water.
  • the crushing / mixing of the fourth calcined body is performed for a longer time than the crushing / mixing of the third calcined body to reduce the particle size.
  • a predetermined amount of binder or the like is added to prepare a slurry.
  • spherical granules are obtained by spraying and granulating this slurry using a spray dryer. From this point onward, the manufacturing method until the inductor core 1 is obtained is the same as the manufacturing method described above.
  • FIG. 10 shows an embodiment of the electronic pen according to the present disclosure.
  • FIG. 10A is a cross-sectional view cut along the central axis direction.
  • 10 (B) is a cross-sectional view taken along the line CC'of FIG. 10 (A).
  • FIG. 10C is a part of an enlarged view of the inductor core shown in FIG. 10A.
  • the electronic pen shown in FIG. 10 is, for example, a mechanical pencil 50 that accommodates a lead (not shown) having a direct line of 0.2 mm or more and 2 mm or less, and extrudes the lead to write.
  • the housing 52 is made of a synthetic resin formed into a substantially cylindrical shape by injection molding.
  • the first tubular body 53 located on the front end side and the second tubular body 54 located on the rear end side are connected via a shaft joint 55.
  • the tip of the first cylinder 53 has a tapered portion 53a whose outer diameter gradually decreases toward the tip.
  • an opening 53b is provided at the tip of the tapered portion 53a so that the writing tip 57 of the mechanical pencil unit 56, which will be described later, protrudes.
  • the second tubular body 54 includes a rear partition wall 54a orthogonal to the central axis in the middle of the central axis direction.
  • the rear partition wall 54a has a pair of arc-shaped leg through holes 54b with the central axis interposed therebetween.
  • the leg through hole 54b is a hole into which the leg 58a of the eraser cradle 58, which will be described later, is inserted.
  • An eraser cradle 58 which is a part of the knock mechanism of the mechanical pencil 50, is inserted in the internal space on the rear side of the rear partition wall 54a of the second cylinder 54.
  • a knock spring 59 is inserted in the internal space on the tip end side of the eraser cradle 58.
  • the tip of the knock spring 59 is in contact with the rear end side surface of the rear partition wall 54a.
  • the rear end portion of the eraser cradle 58 protrudes from the rear end edge of the second tubular body 54, and the eraser 60 is attached to the recess provided in the rear end edge.
  • the eraser 60 is covered with a cylindrical eraser cover 61 whose tip side is open, together with a portion where the eraser cradle 58 protrudes from the rear end edge of the second tubular body 54.
  • the eraser cover 61 also functions as a knock button for the mechanical pencil 56, as will be described later.
  • a pair of legs 58a project from the tip of the eraser cradle 58. The leg portion 58a slidably penetrates the rear partition wall 54a back and forth along with the knocking operation of pressing the eraser cover 61.
  • a pressure sensor 63 is fixed to the front end side surface of the rear partition wall 54a of the second cylinder 54.
  • a refill joint 64 is provided so as to surround the pressure sensor 63.
  • the refill joint 64 is connected to a leg portion 58a through which the rear partition wall 54a is inserted, and can move back and forth in the second tubular body 54 as the eraser cover 61 is knocked.
  • a pressure-sensitive sensor spring 65 is interposed between the refill joint 64 and the front end surface of the rear partition wall 54a.
  • the refill joint 64 and the pressure sensor 63 are not in contact with each other, and the core is not protruding from the writing tip 57.
  • the rear end of the core case pipe 66 of the mechanical pencil unit 56, which is a writing unit, is inserted and fixed in the refill joint 64. As a result, the core case pipe 66 moves back and forth as the refill joint 64 moves back and forth.
  • a front partition wall 55A orthogonal to the axial direction is formed near the tip inside the shaft joint 55.
  • a unit through hole 55b is formed in the front partition wall 55a, and the core case pipe 66 penetrates the unit through hole 55b.
  • the writing tip 69 which is the tip of the internal mechanism 67 connected to the tip of the core case pipe 66, protrudes from the opening 53b.
  • a core mounting hole 55c to which the rear end of the inductor core 1 is mounted is formed on the front end surface of the front partition wall 55a.
  • the inductor core 1 has a columnar shape, and a coil 21 is wound around the straight body portion of the columnar body.
  • the inductor core 1 is located side by side with the mechanical pencil unit 56, and its tip reaches the tapered portion 53a.
  • a capacitor 70 is housed in the internal space on the rear side of the shaft joint 55.
  • the coil 21, the capacitor 70, and the pressure sensor 63 form a circuit by wiring (not shown).
  • FIG. 11 is a perspective view showing the input device of this embodiment.
  • the input device 2 includes a tablet 41 which is a position detecting device including an electronic pen 50 and a sensor (not shown) for detecting a position.
  • the input device 2 can detect the position where the tip of the core 71 comes into contact with the tablet 41.
  • the position detection device may be a tablet 41 or a mobile terminal provided with a touch panel display.
  • As a position detection method in the input device 2 an electromagnetic induction method can be used. Since the straight body portion 12 that is not easily damaged is used, a highly reliable input device 2 can be realized.
  • Inductor core 2 Input device 10 Magnetic material body 10a One end 10b Other end 11 Inclined part 11a Inclined surface 11b End surface 12 Straight body part 12a Outer peripheral surface 12b Central part 12c Near the other end 13 Flange 13a Outer surface 50 Electronic pencil (mechanical pencil) Pencil)

Abstract

L'invention concerne un noyau d'inducteur comprenant un corps en matériau magnétique en colonne comprenant un matériau magnétique qui a des pores à l'intérieur de celui-ci. Le corps en matériau magnétique comprend : une section inclinée présentant une surface inclinée formant une surface périphérique d'un cône tronqué dont le diamètre extérieur croît à partir d'une extrémité vers l'autre extrémité du corps en matériau magnétique ; et une section de corps droite qui est disposée coaxialement avec la section inclinée, s'étend à partir de l'autre extrémité vers ladite extrémité, présente une surface périphérique extérieure formant une surface périphérique d'un corps cylindrique, et se raccorde à la section inclinée. La différence entre la valeur moyenne de la distance entre les centres de gravité des pores dans la section de corps droit et le diamètre moyen des pores dans la section de corps droit est superieure à la différence entre la valeur moyenne de la distance entre les centres de gravité des pores dans la section inclinée et le diamètre moyen des pores dans la section inclinée.
PCT/JP2020/036605 2019-09-30 2020-09-28 Noyau d'inducteur, stylo électronique et dispositif d'entrée WO2021065791A1 (fr)

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US17/764,907 US11955266B2 (en) 2019-09-30 2020-09-28 Inductor core, electronic pen, and input device

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US11749441B2 (en) * 2019-01-11 2023-09-05 Kyocera Corporation Core component, method of manufacturing same, and inductor
JP7198370B2 (ja) * 2019-09-30 2022-12-28 京セラ株式会社 インダクタ用コア、電子ペンおよび入力装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018225719A1 (fr) * 2017-06-06 2018-12-13 日立金属株式会社 Noyau de ferrite conique, son procédé et son dispositif de fabrication, et élément d'inductance l'utilisant
WO2019189937A1 (fr) * 2018-03-30 2019-10-03 京セラ株式会社 Noyau inducteur, partie noyau de stylo électronique, stylo électronique et dispositif d'entrée

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102242362B1 (ko) * 2014-02-12 2021-04-20 가부시키가이샤 와코무 위치 지시기
KR102407443B1 (ko) * 2015-03-06 2022-06-10 가부시키가이샤 와코무 전자펜 및 전자펜용 본체부
TWI736580B (zh) * 2016-04-22 2021-08-21 日商和冠股份有限公司 電子筆及電子筆本體部
JP2018041429A (ja) 2016-09-01 2018-03-15 三菱鉛筆株式会社 デジタイザ筆記具
CN110770681B (zh) * 2017-07-06 2023-08-29 株式会社和冠 电子笔
JP6952591B2 (ja) * 2017-12-11 2021-10-20 株式会社ワコム 電子ペン及び電子ペン本体部
CN110162194A (zh) * 2018-02-14 2019-08-23 株式会社和冠 电子笔的电子电路及电子笔
TWI709021B (zh) * 2018-03-30 2020-11-01 日商京瓷股份有限公司 電感用芯、電子筆用芯體部、電子筆及輸入裝置
JP7198370B2 (ja) * 2019-09-30 2022-12-28 京セラ株式会社 インダクタ用コア、電子ペンおよび入力装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018225719A1 (fr) * 2017-06-06 2018-12-13 日立金属株式会社 Noyau de ferrite conique, son procédé et son dispositif de fabrication, et élément d'inductance l'utilisant
WO2019189937A1 (fr) * 2018-03-30 2019-10-03 京セラ株式会社 Noyau inducteur, partie noyau de stylo électronique, stylo électronique et dispositif d'entrée

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